<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
        </el-col>
      </el-row>
      <!-- 表格 -->
      <tree-table class="treeTable" :data="catelist" :columns="columns"
       :selection-type="false" :expand-type="false" show-index index-text="#" border :show-row-hover="false">
       <!-- 是否有效 -->
       <template slot="isok" slot-scope="scope">
         <i class="el-icon-success"
          v-if="scope.row.cat_deleted === false" style="color: lightgreen"></i>
         <i class="el-icon-error" v-else style="color:red"></i>
       </template>
       <template slot="order" slot-scope="scope">
         <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
         <el-tag type="success" size="mini" v-else-if="scope.row.cat_level===1">二级</el-tag>
         <el-tag type="warning" size="mini" v-else>三级</el-tag>
       </template>
       <template slot="opt" slot-scope="scope">
         <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
         <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
       </template>
      </tree-table>
      <!-- 分页 -->
      <el-pagination
      @size-change="handleSizeChange"
      @current-change="handleCurrentChange"
      :current-page="querInfo.pagenum"
      :page-sizes="[5, 10, 15, 20]"
      :page-size="querInfo.pagesize"
      layout="total, sizes, prev, pager, next, jumper"
      :total="total">
    </el-pagination>
    </el-card>
    <!-- 添加分类 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" @close="addCateDialogClosed" class="aaa">
  <el-form :model="addCateForm" :rules="addCateFromRules" ref="addCateFormRef" label-width="100px">
  <el-form-item label="分类名称：" prop="cat_name">
    <el-input v-model="addCateForm.cat_name"></el-input>
  </el-form-item>
  <el-form-item label="父级分类：">
    <!-- options数据保存数据源 -->
    <el-cascader expand-trigger="hover" :options="parentCateList"
     :props="cascaderProps" v-model="selectedKeys"
    @change="parentCateChanged" clearable></el-cascader>
  </el-form-item>
  </el-form>
  <span slot="footer" class="dialog-footer">
    <el-button @click="addCateDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCate">确 定</el-button>
  </span>
</el-dialog>
  </div>
</template>

<script>
export default {
  data(){
    return{
      querInfo:{
        type:3,
        pagenum:1,
        pagesize:5
      },
      catelist:[],
      total:0,
      // 为table指定列
      columns:[
        {
        label:'分类名称',
        prop:'cat_name'
      },
      {
        label:'是否有效',
        type:'template',
        template:'isok'
      },
       {
        label:'排序',
        type:'template',
        template:'order'
      },
      {
        label:'操作',
        type:'template',
        template:'opt'
      },
      ],
      addCateDialogVisible:false,
      addCateForm:{
        cat_name:'',
        cat_pid:0,
        // 分类的等级默认要添加的是一级分类
        cat_level:0
      },
      // 表单验证规则对象
      addCateFromRules:{
        cat_name:[
          {required:true,message:'请输入分类名称',trigger:'blur'}
        ]
      },
      // 父级分类列表
      parentCateList:[],
      // 指定级联选择器配置对象
      cascaderProps:{
        value:'cat_id',
        label:'cat_name',
        children:'children',
        checkStrictly:true
      },
      // 选中的父级id数组
      selectedKeys:[]
    }
    
  },
  created(){
    this.getCateList()
  },
  methods:{
    // 获取商品分类
    async getCateList() {
      const {data:res} = await this.$http.get('categories',{params:this.querInfo})

      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    handleSizeChange(newSize){
      this.querInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage){
       this.querInfo.pagenum = newPage
       this.getCateList()
    },
    showAddCateDialog(){
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    async getParentCateList(){
      const {data:res} = await this.$http.get('categories',{params:{type:2}})

      if(res.meta.status !== 200){
        return this.$message.error('获取数据失败')
      }
      console.log(res);
      this.parentCateList = res.data
    },
    parentCateChanged(){
      // 如果这个数组中的length大于0，证明选中父级分类
      if(this.selectedKeys.length > 0){
        this.addCateForm.cat_pid = this.selectedKeys
        [
          this.selectedKeys.length -1
        ]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate(){
      this.$refs.addCateFormRef.validate(async valid => {
        if(!valid) return
        const {data:res} = await this.$http.post('categories',this.addCateForm)
     
      if(res.meta.status !== 201){
        return this.$message.error('添加分类失败！')

      }
      this.$message.success('添加成功')
      this.getCateList()
      this.addCateDialogVisible = false
      })
    },
    // 监听对话框关闭事件
    addCateDialogClosed(){
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top:15px ;
}
.el-cascader {
  width: 100%;
}
.aaa {
  width: 1000px;
  margin: 0 auto;
}
</style>